I agree about swimming... so long as you become a member of a master's swimming club. There are so many things to work at in swimming that it can hardly be done without a coach and a good programme. Also, a swimming club can offer you the most convenient time slots to swim (even very early in the morning when the swimming pool would otherwise be not available).
Up until last January I had been with a club for over 7 years, swimming 12 to 16 kilometers every week (I had to quit to concentrate on preparing for the Boston marathon)and, although I agree that swimming is a good complement to running, I have to say that whenever my running was good my swimming was poor, and vice versa.
When you train hard on running you lose some of the flexibility (especially at ankle-level) that is required for efficient and smooth swimming. You also are more prone to cramps (calves).
But the benefits (stronger upper body, improved cardio and resistance) are well worth it but pretty useless for cross-training purposes if you only go for the leisure swim once in a while (unless you have an injury and swimming is part of your rehabilitation).
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